Didascalicon, Book IV: the order and number of the divine books
Chapter XIII. Who made libraries
Among us the martyr Pamphilus, whose life Eusebius of Caesarea wrote, strove to equal Pisistratus in zeal for a sacred library. For he had in his library nearly thirty thousand volumes. Jerome also and Gennadius, searching for ecclesiastical writers throughout the whole world, pursued them in order, and comprised their labors in one little catalogue of a volume.